MBP 2021 16" keeps waking up external LG display

[simonguest]

This thread helped me resolve the issue on my LG 38" display:

For me, the command

sudo pmset -a tcpkeepalive 0

greatly reduced the number of times that the display would wake up.

 

[goro123]

I did get it working (most of the time). I turned off the display Smart energy savings + deep sleep mode. As well as removing the display as a networking interface on macOS. I also reenabled the screen saver.

I couldn't pin point exactly what got working but I followed most of the advices on this thread.

I think the problem is related to either network or (most probable imo) charging. As someone pointed out even though the display is off, is still feeds electricity to the Mac…

 

[eucurto]

Hi guys.

This was happening to me too with my brand new LG 27UP85NP-W.
If I choose Apple-Lock Screen I have the issue everyone is talking about - Mac screen goes full black and LG monitor too but after a few seconds the monitor lights up and stays like that.
If I choose Apple-Sleep the behaviour is the same but on the LG monitor a message appears "No signal - entering power save bla bla" and indeed it goes to sleep!!
Still this is not ideal because I need my Mac to stay awake rendering in Adobe Media Encoder with the screen locked/off and the Sleep option cancels the render.
Hope this helps.

 

[goro123]

Hi guys.

This was happening to me too with my brand new LG 27UP85NP-W.
If I choose Apple-Lock Screen I have the issue everyone is talking about - Mac screen goes full black and LG monitor too but after a few seconds the monitor lights up and stays like that.
If I choose Apple-Sleep the behaviour is the same but on the LG monitor a message appears "No signal - entering power save bla bla" and indeed it goes to sleep!!
Still this is not ideal because I need my Mac to stay awake rendering in Adobe Media Encoder with the screen locked/off and the Sleep option cancels the render.
Hope this helps.

Yes exactly.

I also found that the screen saver helps. Instead of Apple-Sleep try setting a corner to launch the screen saver. I have the computer to display sleep after 20 min. And it works.

 

[ALEUT]

Probably it will help, the issue for me was in programs that have access to the microphone and/or camera. E.g. when I had a call with Zoom and Zoom after that was working (not closed) - the monitor woke up constantly, if I closed Zoom - the monitor slept fine. The same with Slack. If I have at least one call with Slack - the monitor will not sleep, but if I just restart it - the monitor will sleep. I have MBP M2 Pro Max and monitor connected via HDMI.

 

[djc6]

I recently upgraded from a 2019 MacBook Pro with Intel i9 processor to a 2023 16-inch MacBook Pro with M2 processor.

My LG 27UD58P-B 4K 27" display is now doing this - it will wake/sleep repeatedly all night long. I'm using a Caldigit TS3+ hub (which I used on previous intel machine successfully).

I've tried USB-C to DisplayPort cable and a normal full size Displayport cable - either cable have this issue.

I have another LG display connected - 27UL550-W - which does not exhibit this issue.

 

[goro123]

I recently upgraded from a 2019 MacBook Pro with Intel i9 processor to a 2023 16-inch MacBook Pro with M2 processor.

My LG 27UD58P-B 4K 27" display is now doing this - it will wake/sleep repeatedly all night long. I'm using a Caldigit TS3+ hub (which I used on previous intel machine successfully).

I've tried USB-C to DisplayPort cable and a normal full size Displayport cable - either cable have this issue.

I have another LG display connected - 27UL550-W - which does not exhibit this issue.

It seems related to the new Apple Silicon Macs.

I thought a hub would solve that issue, which seems to me related to charging from USB-C. But if you are using a hub, then the hub must be charging the Mac. Are both displays connected in the same way to the hub (USB-C or DisplayPort) ? Have you tried with only the 27UL550-W connected to the hub, and does it reproduces the issue ?

The fix for the moment seems to use either the screen saver or Sleep (not Lock Screen).

 

[goro123]

I wouldn't want to scream "Victory" too early… but 14.1.1 seems to solve my issue !!!

 

[Act1v1si0n]

I have the same issue on my 16 M3 Max with a Samsung Odyssey G5 ultrawide and running 14.1.1. I am using a Belkin Thunderbolt 4 dock with the monitor connected to it via usb c to display port cable. The external display wakes up randomly and goes to sleep because it doesn’t receive a signal.

 

[kk123]

I wouldn't want to scream "Victory" too early… but 14.1.1 seems to solve my issue !!!

That didn't do it for me

Still happening to my two different setups total 4 monitors (LG, Samsung, BENQ), no exceptions (unless connected via the HDMI port).
When connected through a thunderbolt dock, macbook wakes up the dock first, then two monitors both light up and show "no signal". The same if one monitor is directly connected via a usb-c to DP 1.4 cable.

My current workaround is to set "Prevent automatic sleeping when the display is off", so macbook is always awake and stops the spam.

 

[goro123]

That didn't do it for me

Sorry it didn't. I hope it will. I have the display (LG) directly connected to the MacBook Air, and the display is charging the Air. Still working "normally" now.

 

[rusty-mac]

I was able to stop my external monitor from constantly sleeping/waking when my macbook was not in use by disabling "wake for network access" in the MacOS settings on Sonoma 14.2.1.

 

[fabio984]

Got the new Macbook Pro Max M3 and never had this problem with this setup:

LG 27uk650-w, USB-C
+
Dell 24", HDMI.

Switched the Dell to another LG (32UL950-W), USB-C, and start having this problem. Monitor keeps waiking up.
And worst: yesterday I couldn't sleep the mac. I turned sleep and it just flashed and keep on. On the 4 ou 5th try it start sleep mode.

The monitor has two USB-C on the back, may be change to another port will solve the problem? Will try out today. Noticed the problem only yesterday.

 

[F23]

i wonder if this screen wake issue occurs on the Apple Studio Display too

 

[goro123]

While the display issue was solve on my Air M1, I had some issue with a Pro M3. Haven't investigated much though.